[8.15](backport #40485) [vSphere][virtualmachine] Add metrics to virtualmachine metricset

[mergify]

• Enhancement

This PR adds the below metrics to the VirtualMachine

Metrics	API	Field Mappings
VirtualMachine.Summary.QuickStats.UptimeSeconds	Summary	virtualmachine.uptime
VirtualMachine.Summary.OverallStatus	Summary	virtualmachine.status
VirtualMachine.Summary.Datastore	Summary	virtualmachine.datastore.names

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Related issues

• Relates https://github.com/elastic/obs-integration-team/issues/32

---

This is an automatic backport of pull request #40485 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of e1bbe05 has failed:

On branch mergify/bp/8.15/pr-40485
Your branch is up to date with 'origin/8.15'.

You are currently cherry-picking commit e1bbe05be2.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   CHANGELOG.next.asciidoc
	modified:   metricbeat/docs/fields.asciidoc
	modified:   metricbeat/module/vsphere/virtualmachine/_meta/data.json
	modified:   metricbeat/module/vsphere/virtualmachine/_meta/fields.yml
	new file:   metricbeat/module/vsphere/virtualmachine/data.go
	new file:   metricbeat/module/vsphere/virtualmachine/data_test.go
	modified:   metricbeat/module/vsphere/virtualmachine/virtualmachine.go
	modified:   metricbeat/module/vsphere/virtualmachine/virtualmachine_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   metricbeat/module/vsphere/fields.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[botelastic]

This pull request doesn't have a Team:<team> label.

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/8.15/pr-40485 upstream/mergify/bp/8.15/pr-40485
git merge upstream/8.15
git push upstream mergify/bp/8.15/pr-40485

[lalit-satapathy]

LGTM backport PR.